Description: Aluminum metal housing. Matte finish, nonslip rotary button, more comfortable touch and scratch resistance than PP cover. USB plug and play degree rotatable curve button, easy to use (volume adjustment, mute, up and down, pause). Computer sound desktop control. Quickly adjust the volume, say goodbye to the mouse and keyboard, rotate the button to quickly adjust the computer volume. Stable and fast transmission, and the wireless connection distance can reach 15m; For more information, please contact customer service External sound card mode. The computer is equipped with an external sound card. In the computer external sound card mode, you can monitor the computer sound by simply inserting the headphones into the 3.5mm headphone jack. Specification: Colour: Black Material: Metal Size Chart: Approx.: 9.7cmx6.1cmx3.5cm/3.82inchx2.40inchx1.38inch Package Includes: 1 x USB Volume Adjuster